1. May 2006 Navigation John Sonntag EG&G Technical Services, Inc. 10 October 2006

2. Navigation Techniques Two navigation tools available Soxmap  Used for May 2006 GISMO  Standard Twin Otter tool  Visual aid for flight crew  Best for following curved path Course Deviation Indicator (CDI)  Will be used for 2007 GISMO  Can couple to aircraft steering  Good repeatability for long straight lines

3. 23 May 2006 Mission Plan Flight plan was out-and-back Thule to Camp Century, then southeast along 18 May 1999 ATM/KU flight track Inbound leg offset 25 m to south of outbound Constant 10,000' pressure altitude

4. 23 May 2006 Steering Error Outbound from Thule

5. 23 May 2006 Steering Error Inbound to Thule

6. 24 March 2006 P-3 Steering Error with CDI

7. Lessons Learned from May 2006 2006 GISMO flight used Soxmap / Twin Otter combination  Configuration more suitable for outlet glacier work  Steering within +/-50m, could be better 2007 GISMO flights will use CDI with P-3  Better repeatability for straight flight lines  Soxmap backup More info: atm.wff.nasa.gov; click “Aircraft Navigation”